Comrade Jay,
Chinese professional photogrphers used all sorts of equipment before Japanese SLRs flooded the market. Leica M3, IIIF, Contax II,III(a), Kiev 2,3,4, Seagull 4A, Rolleiflex 2.8F,etc.
The Red Flag-20 was a copy of a Leica model (M4?) that was also issued to XINHUA news agency. The Hassyblad 500C copy, DONG FENG(east wind)120 SLR was not popular as it was not very reliable, and was too expensive.
Shanghai 58-II was aimed at amatuer market, it was far less costly(about RMB200, or 5 monthly salary of a young worker's. or more than 2 ounces of 24K gold. 😀 ) About 70,000 Shanghai 58 IIs were made until about 1963. One would have a better chance to find a clean 58-II in big cities and even thogh, they might not work properly. 🙁 These are beautiful paper weights and collectors' treasures.
BTW, a Kiev 4 cost RMB 1,200 in early 1970's that was roughly the same cost as a 3-4 room country house at the time. :bang:
Zhang